Developmental and Structural Section
Kelly, Lawrence M. , Nicholson, Charles .
Floral structure of Symplocos series Symplocos, with emphasis on anatomy and morphology of the style and stigma.
One of the strongly supported groups in recently published phylogenetic analyses of Symplocos is the exclusively neotropical Symplocos series Symplocos. This clade is supported by four morphological synapomorphies, including "subterminal oil-secreting areas on the style." Our purpose is to address the anatomy and histochemistry of the styles, establish the source of oil secretion, and determine the location of the stigmatic surface. The styles are connate into a column with a hollow canal that runs the length of the style. The apex of the style has irregular lobes both terminally and subterminally (abaxially). The terminal lobes of the style are oriented in planes alternating with the subterminal lobes. The subterminal lobes are oriented in the same plane with the angles of the style canal and the locules of the ovary. Pollen is received on the histologically distinctive cells of the subterminal lobes. The stigmatic papillae are slender, pointed, unicellular, and have dense cytoplasmic contents, in contrast to other cells of the style. The stigmas are wet. Stigmatic exudate appears to be produced by the stigmatic papillae, and is evident from preanthesis through flowering. The cells of the stigma, and the exudate, react negatively for insoluble carbohydrate, and positively for lipid and total protein. The subterminal areas of the style do not constitute an oil ring, but are the irregular, subterminal, abaxial lobes of a wet stigma. Characters that may distinguish Symplocos series Symplocos from other members of the genus include lobed, subterminal, wet stigmas with lipid-producing papillae (vs. entire, terminal, dry).
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1 - The New York Botanical Garden, 200th Street and Kazimiroff Boulevard, Bronx, NY, 10458, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Maybird/Cliff Lodge - Level C
Date: Tuesday, July 28th, 2009
Time: 2:30 PM